Optical Meniscus lens

Understanding Optical Meniscus Lenses

What is a Meniscus Lens?

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A meniscus lens is designed with two spherical curved surfaces: convex on one side and concave on the other. It is thicker in the center and thinner at the edges. This specific curvature helps to reduce beam waste and spherical aberration by providing a smaller beam diameter.

Types of Meniscus Lenses

Positive Meniscus Lenses

Positive meniscus lenses are utilized in applications requiring a small focal number, typically less than 2.5. For focal numbers ranging between 2.5 and 10, these lenses help minimize the spot size and enhance image quality. The convex side has a larger curvature compared to the concave side, which has a smaller curvature.

Negative Meniscus Lenses

Negative meniscus lenses are primarily used in applications involving infrared materials with high refractive indexes. These lenses serve as alternatives to other negative lenses, featuring a larger curvature on the concave side and a smaller curvature on the convex side. They are particularly useful in beam-expanding applications that require minimal spherical aberration.

Specifications of Meniscus Lenses from VY

Our product offerings at optec include meniscus lenses with the following specifications:

• Material: BK7 or other optical materials
• Dimension Tolerance: +0.0~-0.1mm
• Center Thickness: +/-0.1mm
• Focal Length Tolerance: +/-1%
• Surface Quality: 40/20
• Surface Figure: Lambda/2 at 633nm on the plano side
• Clear Aperture: >90%
• Chamfer: 0.25mm at 45 degrees typical
• Coating: Optional

If you have specific requirements, please get in touch with us with your drawing or design to obtain the meniscus lens tailored to your needs.

Applications of Meniscus Lenses

Meniscus lenses are widely used in various optical systems to reduce beam waste and spherical aberration. When combined with another lens, the focal length is shortened and the numerical aperture of the system is increased, thereby reducing image distortion and enhancing image resolution.

For additional details, visit Meniscus Cylindrical Lenses for more information.